AI Fitness/Nutrition App Development

I want to build a personalized AI fitness and nutrition mobile app (Android + iOS) for gym users. The app should collect user details (age, weight, goals, dietary restrictions, workout history, water intake, etc.) via a chatbot and optionally sync with wearables (Apple Health, Google Fit, Fitbit).

The app will generate custom daily meal plans (with nutrient breakdowns) and adaptive workout programs based on user fitness level, goals, and available equipment. It should also track hydration, meals, and workouts, and send reminder notifications for training, meals, and water intake.

Key features include:

Conversational chatbot onboarding

Personalized meal plans & grocery suggestions

Adaptive workout generator with progression tracking

Voice assistant for hands-free queries and motivational alerts

Weekly & monthly progress reports with charts/PDF

Privacy-focused design with disclaimers (no steroids/banned substances)

I prefer building this in React Native (frontend) with Node.js + Python backend, but I’m open to suggestions.